Resolve returns in literals

Author: gr8justus

_printf.c

@@ -25,7 +25,7 @@ int _printf(const char *format, ...)
 	{
 		write(2, "Cannot print null\n", 19);
 		va_end(ap);
-		exit(1);
+		return (-1);
 	}
 
 	while (*format)

print_literals.c

@@ -46,7 +46,7 @@ int print_string(va_list ap)
 	{
 		write(2, "Error", 6);
 		va_end(ap);
-		exit(1);
+		return (-1);
 	}
 
 	for (i = 0; i < byte_size; ++i)